Earlier quoted context omitted.
It uses an alternative backend where videos pre-removal had their dislike counters archived, and anything post-removal uses dislike data from users with the extension to crowdsource a likely dislike counter. (in theory, if 5% of viewers of a video are people that have the extension, and only 10% of those viewers hit the dislike button, chances are that's a good sample size to assume that this video should have a 10%…
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There’s also disturbing “children’s videos” made by AIs, and fake lifehack or cooking videos that promise things like “if you microwave popcorn with M&Ms you get chocolate covered popcorn”, some of which show dangerous things that have resulted in accidents (e.g. people getting burnt with exploding eggs and the like).